When running queries in Nepomuk, you do not need to explicitly add the prefix. The prefix will automatically be added by the storage service. In the future we will try to make virtuoso automatically understand all prefixes.

Full Text Indexing

Nepomuk depends on Virtuoso for data storage. Virtuoso brings a lot of nice extensions to SPARQL. Most importantly the full text search which is used through the artificial bif:contains property.

This allows to combine graph queries with full text queries in a nice way: